from machine import Pin
import time

# LED 腳位設定
led_pins = [27, 22, 17]
leds = [Pin(pin, Pin.OUT) for pin in led_pins]

# 按鈕 GPIO 26，使用內部下拉電阻
button = Pin(26, Pin.IN, Pin.PULL_DOWN)

# 變數
debounce_time = 0
index = 0
last_press_time = None  # 記錄最後一次按下時間

def reset():
    global index, last_press_time
    for led in leds:
        led.value(0)
    index = 0
    last_press_time = None
    print("已重設")

print("系統啟動，等待按鈕觸發...")

while True:
    now = time.ticks_ms()

    # 按鈕按下（防彈跳）
    if button.value() and time.ticks_diff(now, debounce_time) > 300:
        debounce_time = now
        last_press_time = now
        print("按鈕按下")

        if index < len(leds):
            leds[index].value(1)
            index += 1
        else:
            reset()

    # 若超過 3 秒未再按下 → 重設
    if last_press_time and time.ticks_diff(now, last_press_time) > 3000:
        reset()

    time.sleep(0.05)